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Across 2. A naturally occurring fatty acid neurotransmitter that selectively activates cannabinoid receptors 4. An extension of the neuronal cell body along which electrochemical signals travel 7. hormones related to the corticosteriods released from the adrenal cortex. 8. Part of the CNS limbic system and a critical brain region for reward systems. 9. A class of biochemical compounds including the transmitters norepinephrine, epinephrine, and dopamine. 12. Biological target of tetrahydrocannabinol in marijuana 14. Specialized nerve cells that make up the nervous system and release neurotransmitters. 16. One of the major divisions of the nervous system, composed of the brain and spinal cord. 18. Supporting cells that are critical for protecting and providing sustenance to the neurons. 21. Maintenance of internal stability; often biochemical in nature. 26. Includes the neurons outside the CNS 27. Male sex hormones 28. A type of substance that activates a receptor. 29. Study of cellular DNA and its functions. 30. Cortical region essential for information processing and decision making. 31. A receptor type activated by ACh; usually excitatory.

Down 1. Study of cellular functions and their regulation 3. Controls the unconscious functions of the body. 4. Agents that antagonize the effects of acetylcholine, 5. Relating to the brain, spinal cord, neurons, and their associated elements. 6. Agents that mimic the effects of norepinephrine or epinephrine. 10. Site of communication between a message-receiving target cell. 11. Relating to hormones, their function and sources. 13. A type of substance that blocks a receptor. 15. Compounds chemically like the steroids that stimulate production of tissue mass. 17. Neurotransmitters that have narcotic-like side effects 19. Special proteins in a membrane that are activated by natural substances or drugs to alter cell function. 20. Receptors activated by opioid narcotic drugs such as heroin and morphine. 22. A minuet gap between the neuron and target cell, across which neurotransmitters travel 23. A receptor type activated by ACh; usually inhibitory 24. Chemical messengers released into the blood by glands. 25. Short branches of neurons that receive transmitter signals